WASHINGTON (AP) — The National Rifle Association's executive vice president continued to oppose background checks for all gun purchases despite polls indicating that most NRA members don't share his position.

The NRA's Wayne LaPierre said on "Fox News Sunday" that background checks for all gun purchases would lead to a national registry of gun owners. Critics say such a registry could lead to taxes on guns or to confiscation.

Mark Kelly, a gun owner and husband of Gabrielle Giffords, the former Arizona congresswoman who survived a 2011 shooting, asked LaPierre to listen to his members. He said the current system prevented 1.7 million gun purchases since 1999. However, those potential buyers had other options because many gun sales don't require a background check.

"Members of the NRA tend to be very reasonable on this issue," Kelly said, who also appeared on the Fox show.

As Congress responds to the spate of mass shootings in recent years, most notably the December massacre of 20 children and six adults in a school in Newtown, Conn., some are calling for a ban on certain semi-automatic weapons and on high-capacity ammunition magazines. However, calls for expanding background checks appear to have gained the most bipartisan support.

LaPierre said that requiring checks for all gun purchases would be a bureaucratic nightmare.

"It's going to affect only the law-abiding people," he said. "Criminals could care less.

LaPierre was pressed about his contention that gun checks would lead to a national registry, when no one from the Obama administration is calling for that.

"And Obamacare wasn't a tax until they needed it to be a tax," LaPierre said. Continued...